Competitive Exams: Chemistry MCQs (Practice-Test 22 of 31)

Uranium-235 decays via a sequence of seven alpha decays and four beta decays to produce a stable nuclide. Which of the following is the nuclide that is produced?

tungsten-207

lead-207

actinium-235

proactinium-219

uranium-238

The half-life of tritium is 12.3 years. If 48.0 mg of tritium is released from a nuclear power plant during the course of an accident, calculate the mass (in mg) of the nuclide that will remain after 5.0 years.

Nuclides that have neutron-to-proton ratios that are too HIGH (compared with stable nuclides) are expected to undergo:

alpha decay.

beta decay.

positron decay.

electron capture.

none of the above:

Radon-222 is a potentially serious problem in many homes. From which of the following naturally-occurring nuclides is radon-222 produced?